Recently, I returned from a trip overseas to Russia, where I took only a carry-on bag. As such, I bought four of those little 3-oz. travel size bottles for my shampoo, conditioner, body wash, and lotion. When I returned home, I decided to just use up what was in those bottles before going back to using the products from the original bottles.
Lo and behold, I discovered that I use significantly less of each product when I use it from the smaller bottle!
My theory is that it is some kind of rationing technique that my brain developed; it sees that I only have a small bottle of the product so I feel compelled to use less of it than if I were pouring it out from the big bottle. It still performs just as well with less, so that isn’t an issue at all.
So if you’re looking to save a little bit of money and use less resources, try moving your things (beauty products, toiletries, even try some foodstuff!) to smaller containers. You might also trick your brain into using less! Also, the smaller containers take up significantly less room in the shower!